<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
    <script src="lib/http-promise.js"></script>
</head>

<body>
    <script>
        http("top/playlist?cat=华语").then(res=>{
            let id=res.playlists[0].id;
            return id
        }).then(res=>{
            http(`playlist/detail?id=${res}`).then(res=>{
                let id=res.playlist.trackIds[0].id;
                return id
            }).then(res=>{
                http(`song/url?id=${res}`).then(res=>{
                    console.log(res)
                })
            })
        })
    </script>

</body>

</html>